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@ -1,16 +1,38 @@
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#include "BatteryController.h"
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#include <hal/nrf_gpio.h>
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#include <nrfx_saadc.h>
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#include <libraries/log/nrf_log.h>
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#include <algorithm>
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#include <math.h>
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using namespace Pinetime::Controllers;
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#define SAMPLES_IN_BUFFER 1
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static nrf_saadc_value_t m_buffer_pool[2][SAMPLES_IN_BUFFER];
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static float voltage = 0.0f;
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static int percentRemaining = -1;
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void Battery::Init() {
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nrf_gpio_cfg_input(chargingPin, (nrf_gpio_pin_pull_t)GPIO_PIN_CNF_PULL_Pullup);
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nrf_gpio_cfg_input(powerPresentPin, (nrf_gpio_pin_pull_t)GPIO_PIN_CNF_PULL_Pullup);
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}
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void Battery::Update() {
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isCharging = !nrf_gpio_pin_read(chargingPin);
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isPowerPresent = !nrf_gpio_pin_read(powerPresentPin);
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// Non blocking read
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SaadcInit();
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nrfx_saadc_sample();
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}
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void Battery::SaadcInit() {
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nrfx_saadc_config_t adcConfig = NRFX_SAADC_DEFAULT_CONFIG;
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nrfx_saadc_init(&adcConfig, SaadcEventHandler);
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APP_ERROR_CHECK(nrfx_saadc_init(&adcConfig, SaadcEventHandler));
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nrf_saadc_channel_config_t adcChannelConfig = {
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.resistor_p = NRF_SAADC_RESISTOR_DISABLED,
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.resistor_n = NRF_SAADC_RESISTOR_DISABLED,
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@ -18,32 +40,50 @@ void Battery::Init() {
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.reference = NRF_SAADC_REFERENCE_INTERNAL,
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.acq_time = NRF_SAADC_ACQTIME_3US,
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.mode = NRF_SAADC_MODE_SINGLE_ENDED,
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.burst = NRF_SAADC_BURST_DISABLED,
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.burst = NRF_SAADC_BURST_ENABLED,
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.pin_p = batteryVoltageAdcInput,
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.pin_n = NRF_SAADC_INPUT_DISABLED
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};
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nrfx_saadc_channel_init(0, &adcChannelConfig);
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APP_ERROR_CHECK(nrfx_saadc_channel_init(0, &adcChannelConfig));
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APP_ERROR_CHECK(nrfx_saadc_buffer_convert(m_buffer_pool[0],SAMPLES_IN_BUFFER));
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APP_ERROR_CHECK(nrfx_saadc_buffer_convert(m_buffer_pool[1],SAMPLES_IN_BUFFER));
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}
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void Battery::Update() {
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isCharging = !nrf_gpio_pin_read(chargingPin);
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isPowerPresent = !nrf_gpio_pin_read(powerPresentPin);
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void Battery::SaadcEventHandler(nrfx_saadc_evt_t const * p_event) {
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int avg_sample = 0;
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int i = 0;
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nrf_saadc_value_t value = 0;
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nrfx_saadc_sample_convert(0, &value);
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const float battery_max = 4.18; //maximum voltage of battery ( max charging voltage is 4.21 )
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const float battery_min = 3.20; //minimum voltage of battery before shutdown ( depends on the battery )
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// see https://forum.pine64.org/showthread.php?tid=8147
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voltage = (value * 2.0f) / (1024/3.0f);
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int percentRemaining = ((voltage - 3.55f)*100.0f)*3.9f;
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percentRemaining = std::max(percentRemaining, 0);
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percentRemaining = std::min(percentRemaining, 100);
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if (p_event->type == NRFX_SAADC_EVT_DONE) {
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APP_ERROR_CHECK(nrfx_saadc_buffer_convert(p_event->data.done.p_buffer, SAMPLES_IN_BUFFER));
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percentRemainingBuffer.insert(percentRemaining);
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for (i = 0; i < SAMPLES_IN_BUFFER; i++) {
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avg_sample += p_event->data.done.p_buffer[i]; // take N samples in a row
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}
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avg_sample /= i; // average all the samples out
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// NRF_LOG_INFO("BATTERY " NRF_LOG_FLOAT_MARKER " %% - " NRF_LOG_FLOAT_MARKER " v", NRF_LOG_FLOAT(percentRemaining), NRF_LOG_FLOAT(voltage));
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// NRF_LOG_INFO("POWER Charging : %d - Power : %d", isCharging, isPowerPresent);
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voltage = (static_cast<float>(avg_sample) * 2.04f) / (1024 / 3.0f);
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voltage = roundf(voltage * 100) / 100;
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percentRemaining = static_cast<int>(((voltage - battery_min) / (battery_max - battery_min)) * 100);
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percentRemaining = std::max(percentRemaining, 0);
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percentRemaining = std::min(percentRemaining, 100);
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nrfx_saadc_uninit();
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}
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}
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void Battery::SaadcEventHandler(nrfx_saadc_evt_t const * event) {
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int Battery::PercentRemaining() {
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return percentRemaining;
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}
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float Battery::Voltage() {
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return voltage;
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}
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